Add Windows-only steps for using screen reader-based Tolk in the editor.

README.md

@@ -35,7 +35,16 @@ rate = 50 ; range is 0 to 100.
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 5. Optionally, set up Android TTS. After performing [Android export setup](https://docs.godotengine.org/en/3.2/getting_started/workflow/export/exporting_for_android.html) and downloading templates, click _Project -> Install Android Build Template_. Copy, or link, _addons/godot-tts/android_ to _android/godot-tts_.
-6. Launch your project in the editor by running `godot -e` in the top-level directory. Or, to launch the game normally, simply run `godot`.
+6. Perform the below Windows-only procedure if you would prefer that editor speech be done with your screen reader. Note that these steps aren't necessary if all you want is speech in exports.
+7. Launch your project in the editor by running `godot -e` in the top-level directory. Or, to launch the game normally, simply run `godot`.
+
+Windows-only: If you need speech in the editor and would prefer to use your screen reader, please perform the following additional steps:
+
+ * Place godot.exe in the working directory of your game.
+ * Copy all DLLs from addons\godot-tts\target\release to the game's working directory.
+ * Use the godot.exe executable in your game directory to edit and run the game.
+
+Without these changes, you'll only get SAPI speech in the editor. Exporting games correctly places dependent DLLs alongside the game executable, so these steps aren't needed if you only want accessibility during the game itself.
 
 ## What is provided?